package com.aimuceliang.aimuceliang.utils;

import android.content.Context;
import android.util.TypedValue;

/** 
 * 常用单位转换的辅助类 
 *  
 *  
 *  
 */  
public class DensityUtils  
{  
    private DensityUtils()  
    {  
        /* cannot be instantiated */  
        throw new UnsupportedOperationException("cannot be instantiated");
    }  
  
    /** 
     * dp转px 
     *  
     * @param context 
     * @param dpVal
     * @return
     */  
    public static int dp2px(Context context, float dpVal)
    {  
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                dpVal, context.getResources().getDisplayMetrics());  
    }  
  
    /**
     * sp转px
     *
     * @param context
     * @param spVal
     * @return
     */
    public static int sp2px(Context context, float spVal)
    {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
                spVal, context.getResources().getDisplayMetrics());
    }

    /** 
     * px转dp 
     *  
     * @param context 
     * @param pxVal 
     * @return 
     */  
    public static float px2dp(Context context, float pxVal)
    {  
        final float scale = context.getResources().getDisplayMetrics().density;  
        return (pxVal / scale);  
    }  
  
    /**
     * px转sp
     *
     * @param context
     * @param pxVal
     * @return
     */
    public static float px2sp(Context context, float pxVal)
    {
        return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
    }
  
}  